Use 'user support' consistently rather than 'user interaction'
Restructure under 'maintenance' and 'support', add TOC
Add section on removing message from holding pen.

Text adapted from https://github.com/mysociety/alaveteli/issues/465
Add a section on editing outgoing messages

Text adapted from https://github.com/mysociety/alaveteli/issues/465
Add a section on banning a user.

Text adapted from https://github.com/mysociety/alaveteli/issues/465
Add a section on deleting requests.
Use 'admin interface' instead of 'admin tool'
Add some basic instructions on changing the visibility of a request.
Add basic info on hiding incoming or outgoing messages.
Add some more details to the instructions for adding censor rules.
Merge branch 'gh-pages-hiding-instructions' into gh-pages
Merge branch 'gh-pages' of ssh://git.mysociety.org/data/git/public/alaveteli into gh-pages